I'm no math wizard, but this just dawned on me. If you have an 11 foot hammock, and you want your ridgeline to be 83% of the total length of the hammock (109.5 in.) to create a 30% sag, then your hammock ridgeline is going to be significantly higher off the ground than a 9 ft. hammock if you want to maintain an 18" height from bottom of hammock to ground.
Is this a duh moment for me? Am I stating the obvious?